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97 lines
4.3 KiB
97 lines
4.3 KiB
``DEFAULT``
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This feature corresponds to standard linking, essentially equivalent to
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using no feature at all. It is typically only used with the
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:prop_tgt:`LINK_LIBRARY_OVERRIDE` and
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:prop_tgt:`LINK_LIBRARY_OVERRIDE_<LIBRARY>` target properties.
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``WHOLE_ARCHIVE``
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Force inclusion of all members of a static library. This feature is only
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supported for the following platforms, with limitations as noted:
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* Linux.
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* All BSD variants.
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* SunOS.
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* All Apple variants. The library must be specified as a CMake target name,
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a library file name (such as ``libfoo.a``), or a library file path (such as
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``/path/to/libfoo.a``). Due to a limitation of the Apple linker, it
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cannot be specified as a plain library name like ``foo``, where ``foo``
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is not a CMake target.
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* Windows. When using a MSVC or MSVC-like toolchain, the MSVC version must
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be greater than 1900.
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* Cygwin.
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* MSYS.
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``FRAMEWORK``
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This option tells the linker to search for the specified framework using
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the ``-framework`` linker option. It can only be used on Apple platforms,
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and only with a linker that understands the option used (i.e. the linker
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provided with Xcode, or one compatible with it).
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The framework can be specified as a CMake framework target, a bare framework
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name, or a file path. If a target is given, that target must have the
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:prop_tgt:`FRAMEWORK` target property set to true. For a file path, if it
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contains a directory part, that directory will be added as a framework
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search path.
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.. code-block:: cmake
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add_library(lib SHARED ...)
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target_link_libraries(lib PRIVATE "$<LINK_LIBRARY:FRAMEWORK,/path/to/my_framework>")
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# The constructed linker command line will contain:
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# -F/path/to -framework my_framework
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File paths must conform to one of the following patterns (``*`` is a
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wildcard, and optional parts are shown as ``[...]``):
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* ``[/path/to/]FwName[.framework]``
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* ``[/path/to/]FwName.framework/FwName``
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* ``[/path/to/]FwName.framework/Versions/*/FwName``
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Note that CMake recognizes and automatically handles framework targets,
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even without using the ``$<LINK_LIBRARY:FRAMEWORK,...>`` expression.
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The generator expression can still be used with a CMake target if the
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project wants to be explicit about it, but it is not required to do so.
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The linker command line may have some differences between using the
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generator expression or not, but the final result should be the same.
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On the other hand, if a file path is given, CMake will recognize some paths
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automatically, but not all cases. The project may want to use
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``$<LINK_LIBRARY:FRAMEWORK,...>`` for file paths so that the expected
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behavior is clear.
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``NEEDED_FRAMEWORK``
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This is similar to the ``FRAMEWORK`` feature, except it forces the linker
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to link with the framework even if no symbols are used from it. It uses
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the ``-needed_framework`` option and has the same linker constraints as
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``FRAMEWORK``.
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``REEXPORT_FRAMEWORK``
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This is similar to the ``FRAMEWORK`` feature, except it tells the linker
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that the framework should be available to clients linking to the library
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being created. It uses the ``-reexport_framework`` option and has the
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same linker constraints as ``FRAMEWORK``.
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``WEAK_FRAMEWORK``
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This is similar to the ``FRAMEWORK`` feature, except it forces the linker
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to mark the framework and all references to it as weak imports. It uses
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the ``-weak_framework`` option and has the same linker constraints as
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``FRAMEWORK``.
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``NEEDED_LIBRARY``
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This is similar to the ``NEEDED_FRAMEWORK`` feature, except it is for use
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with non-framework targets or libraries (Apple platforms only).
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It uses the ``-needed_library`` or ``-needed-l`` option as appropriate,
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and has the same linker constraints as ``NEEDED_FRAMEWORK``.
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``REEXPORT_LIBRARY``
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This is similar to the ``REEXPORT_FRAMEWORK`` feature, except it is for use
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with non-framework targets or libraries (Apple platforms only).
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It uses the ``-reexport_library`` or ``-reexport-l`` option as appropriate,
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and has the same linker constraints as ``REEXPORT_FRAMEWORK``.
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``WEAK_LIBRARY``
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This is similar to the ``WEAK_FRAMEWORK`` feature, except it is for use
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with non-framework targets or libraries (Apple platforms only).
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It uses the ``-weak_library`` or ``-weak-l`` option as appropriate,
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and has the same linker constraints as ``WEAK_FRAMEWORK``.
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